Combined gas and coal range



F/V. 'KNAUSS.

COMBINED GAS AND COAL RANGE. APPLICATION FILED MAR. 19, 1919.

2 SHEETS-SHEET 1.

Patented May 31, 1921.

F. v. KNAUSS.

COMBINED GAS AND COAL RANGE. 7 APPLICATION HLE D MAR. 19, I919. 1,380,151 Patented May 31, 1921.

2 SHEETS$HEET 2.

J v I (fl mmM HM M "Q anew/111 4? UNETED STATES FRANK V. KNAUSS, OF EOBTSMOUTI-I, OHIO.

COMBINED GAS AND COAL RANGE.

Specification of Letters Patent.

Patented May 31, 1921.

Application filed March 1%, 1919. Serial No. 283,569.

Y '0 aZZ whom it may concern Be it known that T, FRANK V. KNAUss, a citizen of the United States, and residing at Portsmouth, in the county of Scioto and State of Ohio, have invented a new and useful Improvement in Combined Gas and Coal Ran es, of which the following specification is a rull disclosure.

lviy invention relates to ranges designed for use with solid or gaseous fuel.

An object of the invention is to provide a cooking range with an oven, capable of being externally heated by the products of combustion from a solid fuel passage through a down draft flue around the oven, and internally heated by a gas burner within the oven, with a permanently open ventilating scuttle at the base of the oven, admitting air into the oven for the proper circulation of the gases within the oven and for supporting combustion, arranged so that the oven may be either alternately heated externally by a solid fuel or internally by a gaseous fuel, without the use of dampers or regulating means when the conversion is made from one method to the other, and in which both methods of heating may be simultaneously employed.

The features of the invention will be more fully set forth in the description of the accompanying drawings, forming a part' of this specification, in which:

Figure 1 is a perspective view of my improved combination gas and coal range.

Fig. 2 is a central vertical section through the range with the upper cabinet removed.

Fig. 3 is a transverse section on line 3, 3, Fig. 2.

Fig. l is a detail top plan view of the oven burner. v

Fig. 5 is a detail front elevation of a scuttle in the side of the range leading into the oven, through which the neck of the oven burner projects.

.leferring to the drawings, 1 indicates the outer casing of the range or stove, containing the tire-box 2, the grate 1 at the base of the fire-box, the ash-pit 5, the oven 6, the top 7 for the coal burning section of the range, and the top 8 for the gas burnmgsection. The tops are provided with the usual openings covered by lids or grids. The gas burner section is adjacent the coal burning section as an extension thereof formed by the dished casing portion 9 for receiving the gas burner, and with the top 7 of the coal burning section forms an upper wall for the horizontal flue 10 over the oven 6, the main top 11 of the oven forming the base wall for said flue. The outer casing has a double walled bottom consisting of the bottom plate 12 and the sub-bottom plate spaced from plate 12 and providing an intermediate dead air space as an insulating chamber.

The oven is formed by the side vertical wall 14: separating the oven from the firebox and ash-pit, opposite vertical side wall 15 spaced from the side wall of the outer casing, with the spacebetween said oven and easing walls providing a vertical down-flue 16, communicating at its upper end with the horizontal flue 10 over the oven. 17 inclicates the bottom of the oven spaced from the bottom wall of the casing to provide an intermediate horizontal base flue l8 immediately below the oven. Said fine 18 communicates with the vertical down-flue 16 and with the vertical escape or stack flue 19 through an opening 19 in the rear wall of the casing l. The flue 19 is formed by a casing 20 secured to the rear wall of the casing 1. The oven is heated by the gases of combustion from the fire-box passing through the top horizontal flue 10, down the vertical fine 16 and through the base flue 18 to the escape flue in the rear of the range casing. A. damper regulator opening 21 connects the horizontal flue with the stack flue, at the upper end thereof for a direct draft and escape of the smoke and products from the fire-box into the stack flue, a feature common with all coal burning cook stoves.

For heating the top of the stove it is essential that the space for the gas burners should be separated and distinct from the flue for the gaseous products from the solid fuel in the fire-box, but it is equally desirable to have a flush top for both the coal heated and gas heated sections. The dished casing 9, which is arranged beneath the gas burner topsection 8 as a chamber, may connect with the escape flue to provide a vent for the escape of gases from the top gas burners.

The oven bottom 17 has a central longitudinal depression 22 as a pocket for the oval-shaped oven gas burner 23. This depression or pocket opens through the side wall 15 of the oven and connects with a scuttle 2 1 leading through the fine 16 and side wall of the outer casing 1 as a passageway for the neck 24 of the gas burner. The scuttle has a swiveled shutter or closure plate 25 notched to engage centrally over the neck 24? of the oven gas burner and also provide a constantly open port 25 for a free air inlet to the oven burner when the shutter is closed. The scuttle opening permits the burner to be readily removed and inserted. The burner connects with a gas supply pipe 26 which extends upwardly connecting with a gas supply pipe section 27 for the burners disposed within the chamber of the casing 9 of the gas burner section;

The oven top is of double wall formation to provide a flue 28 communicating with the oven through a port 29 at the forward end of the oven. The flue 28 at its rear end connects with the escape line 19 through a passage 30 to ventilate the oven and carry ofi any fumes rising in the oven. The flue 28 connects with the oven and escape flue 19 and provides an uninterrupted passage for the escape of products from the oven and also provides for a constant circulation of air from the scuttle opening 25 through the oven to the escape flue 19. The oven is provided with the usual perforated tray superposed above the oven gas burner. The oven top 11 is also provided with an insulating lining 31 to prevent the abstraction of too great a heat from the gases of the top fine 10, and which would have a tendency to reduce the temperature of the gases passing down the vertical flue 16 and through the base flue 18. 7

It has always been regarded as detrimental to the efficiency of the oven to heat the oven externally, as by the products from the solid fuel, if any venting of the oven is permitted. here the oven is internally heated, ventilation is essential to the proper circulation of the gases within the oven chamber to supply oxygen to the burner for supporting combustion. Therefore, it has been customary to provide means for alternately venting and cutting off the draft connection to the even. 1, without the use of any damper or regulator, and with absolutely no change of fines, can use the oven for baking with either coal or gas, or both kinds of fuel, for either baking or cooking, at the same time, due to the fact that when coal is used to heat the oven no cold air draft is permitted to enter the oven. The admis sion of hot air into the oven when the oven is extremely heated, will not destroy or diminish the heating efiiciency, but on the contrary, will provide a circulation of air in the oven, allowing the fumes in the oven to be carried off.

The scuttle, providing an opening for the oven to the atmosphere, extends through the down flue 16, crosses centrally through said passage, is highly heated, and through which the incoming air to the oven must pass, so that the air will be heated before it enters the oven when the oven is externally heated, while none of the coal gases in said down flue escape into the oven through the scuttle.

The shutter for the scuttle is not intended as a regulating means for the air inlet, but merely for the purpose of closing a certain portion of the opening area, which must be large enough to permit the convenient removal of the burner, and leave a permanently open area for free air inlet.

Having described my invention, I claim:

1. A combined solid fuel and gas burning stove comprising an outer casing and an oven casing within the outer casing and therewith forming a solid fuel burning chamber at one side of said casings and a dew -draft flue for said chamber surround ing the top, opposite side and bottom of said even casing, a stack fine for said downdraft iiue, said even casing having a centrally recessed base and a doublewalled top, the double-walled top providing an 7 intermediate flue communicating with the interior of the oven and said stack flue, a conduit joined to said casings and extending horizontally through said clown-draft flue at the oven base providing a constantly open air passage into the oven chamber, and a gas burner disposed within the recess of said oven base having a gas inlet pipe neck extending through said air passage.

2. A a combined solid fuel and gas burning stove comprising an outer casing and an oven easing within the outer casing and therewith forming solid fuel burning chamber at one side of said casings and a down-draft fine for said chamber surrounding the top, opposite side and bottom of said oven casing, said. oven casing having a centrally recessed base and a double-walled top, the double-walled top providing an intermediate vent flue communicating with the interior the oven, conduit traversing said down-draft flue at the oven base providing constantly open air passage into the oven chamber below the base plane of the oven, and a gas burner disposer within th recess of said oven base having a gas inlet pipe neck extending through said conduit.

In witness whereof I hereunto subscribe my name, as attestedby the two subscribing witnesses.

FRANK V. KNAUSS.

Witnesses HENRY Soor'r, Jr., ALFRED W. Zorrons. 

